catilaginea, maturitate brunneola vel brunnea venis albis vel
Introduction
Carl Lumholtz, a Norwegian explorer, collected
Melanogaster variegatus var. mexicanus Farlow nom. nud. (=
M. umbrinigleba Trappe & Guzmán) while exploring the
Chihuahuan mountains in northern Mexico (Lumholtz,
1902). This was the first record of a sequestrate fungus from
Mexico. Cázares et al. 1992 described Melanogaster
variegatus found in oak forests in northern Mexico. Here we
describe another new Melanogaster species from northern
Mexico. It is notable for its bright yellow peridium and small
spores.
Melanogaster minysporus sp. nov. un nuevo miembro secuestrado de los
Boletales de México
Resumen. Se describe una nueva especie Melanogaster minysporus recolectada en el norte
de México, en el estado de Nuevo León. La especie se distingue por presentar un peridio
amarillo brillante que se mancha de rojizo cuando se maltrata y por las esporas pequeñas.Palabras clave: Paxillaceae, hipogeos, Quercus.
Abstract. Melanogaster minysporus is described as a new species from northern Mexico
(Nuevo Leon). It is distinctive in the genus in having a bright yellow peridium that stains
reddish where bruised in fresh and small spores.Key words. Paxillaceae, hypogeous, Quercus.
Recibido 10 de octubre 2008; aceptado 5 de diciembre 2008.
Received 10 October 2008; accepted 5 December 2008.
1 Oregon State University, Department of Forest Ecosystem and Society, Corvallis, Oregon 97331-5752, USA. 2 Instituto Tecnológico de Cd. Victoria, Av. Portes Gil 1301 Pte. C.P. 87010, A.P. 175 Cd. Victoria, Tam., México
Melanogaster minysporus sp. nov., a new sequestrate member of the Boletales from Mexico
1 2Efrén Cázares , Gonzalo Guevara , 2 1Jesús García , James M. Trappe
flavis marmorata. Sporae subfusiformes vel obovoideae, (5-)
5.5-6.5 x (3-) 4-5 µm, laeves, avellaneae vel brunnea.
Holotypus hic designatus: Mexico, Nuevo Leon,
Santiago, El Barro, Guevara 907, ITCV.
Basidiomata hypogeous, 13-35 x 10-27 mm,
globose to subglobose-lobed, depressed at the base, the
surface smooth to finely fibrillose, bright yellow, staining
reddish where bruised when fresh. Gleba solid, gelatinous-
rubbery, pale brown in youth, at maturity dark brown with
white to yellow, sterile veins. KOH reddish brown on fresh
peridium and black on dried specimens. FeS0 black on dried 4
specimens.
Peridium 160-240 µm thick. Epicutis of appressed,
hyaline, thick-walled up to 1 µm thick, interwoven hyphae
upto 4 µm in diam with clamp connections, orange-brown to
stains red when exposed; this species was described from
central Europe (Trappe, 1975).
Acknowledgments
We thank the Dirección General de Educación Superior
Tecnológica for financial support.
References
Castellano, M.A., J.M. Trappe, Z. Maser, C. Maser, 1989. Key to spores of the genera of hypogeous fungi of north temperate forests with special reference to animal mycophagy. Mad River Press, Eureka, California.
Cázares, E., J. García, J. Castillo, J. M. Trappe, 1992. Hypogeous fungi from northern Mexico. Mycologia 84: 341-359.
Lumholtz, C. 1902. Unknown Mexico. Vol 1. Charles Scribner's Sons, New York.
Trappe, J. M. 1975. A revision of the genus Alpova with notes on Rhizopogon and the Melanogastraceae. Nova Hedwigia Beiheft 51: 279-310.
Wang, Y., Chang, M., Tao, K., Liu, B. 1995. New species and new varieties of the genus Melanogaster from Ching. Journal of Shanxi University (Nat. Sci. Ed.) 18: 449-453.
yellow-brown in KOH and Melzer's reagent. Subcutis of
interwoven hyphae, thin- to thick walled, hyphae hyaline in
KOH and yellowish in Melzer's reagent. Spores (5-) 5.5-6.5 x
(3-) 4-5 µm, subfusoid to obovate, smooth, thick-walled, up to
1 µm thick, the sterigmal attachment distinct, in KOH and
Melzer's reagent yellow brown to brown singly, dark brown to
black in mass.
Etymology: Greek, miny- (small) and spora
(spores).
Habitat and season: Hypogeous to subhypogeous,
single to gregarious, in mixed Pinus-Quercus forests, under
Quercus canbyi and Q. rhyzophylla. August through
September.
Collections examined: HOLOTYPE: Mexico,
Nuevo Leon, Santiago, El Barro, camino al paraje del oso, 6
August, 2007, Guevara 907 (ITCV, isotype OSC).
PARATYPES (all ITVC): Nuevo Leon, Sierra Madre
Oriental, Mpio. Santiago, Cañon de Puerto Genovevo, 11
September 1983, García 3802; 7 September 1983, García
3803; 7 August 1983, García 3804; 7 August 1983, García
3805; 29 September 1983, García 3814; Mpio. Guadalupe,
La Pastora, 20 June 1984, G. Valencia s.n.
Discussion. This species is distinguished by its
bright yellow peridium that stains reddish where bruised
when fresh, KOH and FeSO black on dried peridium, and 4
small spores. Melanogaster ovoidisporus Y. Wang, described
from China (Wang et al., 1995) is a similar species with small
spores (5-) 5.5-6.5 (-7) x (3.5-) 4-5 (-5.8) µm, but its peridium
is brown. They also described M. ovoidisporus var.
angustatosporus K. Tao, Chang & Liu with narrower spores
5.5-6.5 (-7) x 3-4 µm.
Alpova microspora (Velen.) Trappe, has a yellow
peridium and a rubbery-gelatinous gleba, but its spores are
fusiform to oblong, (4-) 4.5-6 (-7) x 2-3 (-4) µm and its gleba
